x²-100=0
x² = 100
donc x = √100 = 10
x²+25=0
x² = - 25
Pas de solution car - 25 < 0
x²- 9/6 =0
x² = 9/6 = 3/2
x = √(3/2)
4x²=36
x²=36/4
x²=9
x = √9
x = 3
7x²=49
x²=49/7
x²=7
x = √7
6x²=96
x²=96/6
x²=16
x = √16
x = 4
-2x²=24
x²= - 12
Pas de solution car - 12 < 0
